Romantic ideas for honeymoon activities? (No, I'm not talking about !)?

This is a serious question, and not about : My partner and I are getting married in April and will have a 5 day honeymoon in a cabin in the mountains. It will be kind of remote and early enough to still be chilly outside. It's a short honeymoon and in state because my sister is due around then and I need to be there for her (single mom). My partner and I have a LOT of stress going on this year and I want to use this vacation for rejuvenation. I'm worried I'll be distracted and maybe bored, and later regret not enjoying it. What are some really relaxing, romantic, or memorable things you did on your honeymoon? Things you wish you'd done? Things that really made it seem once in a lifetime?